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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60346d064b22dd5350f5183d208b928c55be897ae26f1c10b9d5dbe44035db6' 
  AND token = 'CxTFYDkAs+nek2ApyxHftGy0c1pVVUqJa/csZZYmMvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}